Pivot bearing



FIG. 1 is a top plan view of a pivot bearing showing an embodiment of our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right-hand side view thereof, and is also a mirror image of a left-hand side view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for a pivot bearing, as shown and described. 